... HDMI, 8pcs HDD 4.2U 16CH NVR High Quality Dahua Onvif Nvr 4/8/16 Channel 2U Professional NVR3816 Model: NVR3804/3808 ... , BNC(200-3000mV, 5KΩ)DisplayDisplay Split1/41/4/8/91/4/8/9/16Resolution1920×1080, 1280×1024, 1280×720, 1024 ... Interface4 USB2.0 ports, For mouse control & backupRS232Dahua keyboard, PC communicationRS485PTZ controlEnvironmentalPower SupplyAC 100~240 V, 50/60 HzPower Consumption20W ...